Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description discloses that page content is not stored, which is a meaningful behavioral guarantee. However, with no annotations provided, it does not fully describe other behaviors such as network access, error handling, or the fact that many accepted parameters are ignored or discarded.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, concise sentence that directly states the tool's purpose and a key constraint. It is well-structured and easy to parse with no unnecessary detail.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description explains the core output but lacks context for the unusually broad set of optional parameters and does not specify output format or error behavior. Given the complexity of the schema, some additional context about valid usage would improve completeness.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the baseline is 3. The description itself adds no parameter-level meaning beyond the schema descriptions. While individual parameter descriptions are explicit about discarding or validation, the tool description does not clarify how the many unrelated parameters relate to the stated URL-focused purpose.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool returns host, scheme, and HTTP status for a URL, and explicitly notes that page content is not stored. It is specific about the primary action and output, though it does not differentiate itself from sibling tools that might perform similar URL checks.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives no guidance on when to use this tool versus alternatives such as fetch-status or normalize-url. It only states what it does and that content is not stored, leaving the agent to infer appropriate use cases without explicit direction.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.